@@ -0,0 +1,12 @@
+---
+'@object-ui/app-shell': patch
+'@object-ui/i18n': patch
+---
+
+fix(studio): leaving the Validations or Actions tab, or the metadata editor's selection, keeps an expression that does not parse unsaved and names it (#27629)
+
+Clause-②: no
+Metadata-protocol: none
+
+- The Data pillar's Validations and Actions panels held the object's draft while a rule's guard or an action's predicate did not parse, but only while their tab was open: leaving the tab ended the hold, and the autosave sent the broken expression as the object's draft. The hold now belongs to the draft, as the field inspector's does since #27485: it lasts while the draft still carries the rule or action the editor judged, and ends when that item is edited, removed or the object reloads. While it lasts, the pillar shows the held line ("Not saved yet: an expression on the rule “Rule A” has an error to fix…") with a **Show me** that reopens the rule or action, and a switch to another object asks first.
+- The metadata editor (`ResourceEditPage`) did the same with its selection: clearing or changing it re-enabled Save and the autosave over a broken predicate in the item it had open. The hold now stays with the draft slice the inspector judged, the editor shows a held line naming the item, and **Show me** reselects it.
@@ -0,0 +1,179 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * objectstack#27629 — the metadata editor keeps a scoped inspector's CEL hold
+ * with the DRAFT, not with the selection.
+ *
+ * The maintainer's ruling on #27485 (comment 6500685972, 2026-10-29T15:17Z,
+ * letter A) makes a CEL parse-fault hold belong to the draft: it lasts while
+ * the draft still carries the text the editor judged; editing that text,
+ * removing the item or reloading ends it; while it holds, a held line names the
+ * item with a "Show me" that reopens it. Item 3 asks for the sibling surfaces;
+ * this suite pins `MetadataResourceEditPage`. Before this card the inspector's
+ * count was stamped with the selection, so clearing or changing the selection
+ * released Save and the autosave while the broken predicate stayed in the draft.
+ *
+ * Set up as {@link file://./ResourceEditPage.celGate.test.tsx}: only the page
+ * canvas is stubbed (to emit selections); the block inspector, its
+ * ConditionBuilder and this host's gating are real, the CEL engine is stubbed.
+ */
+
+import '@testing-library/jest-dom/vitest';
+import * as React from 'react';
+import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
+import { render, screen, fireEvent, cleanup, waitFor } from '@testing-library/react';
+import { MemoryRouter } from 'react-router-dom';
+
+const PAGE = {
+  name: 'home',
+  label: 'Home',
+  type: 'home',
+  template: 'default',
+  regions: [
+    {
+      name: 'main',
+      components: [
+        { type: 'text', id: 'b1', visibleWhen: 'record.amount > 10' },
+        { type: 'text', id: 'b2' },
+      ],
+    },
+  ],
+};
+
+const mockClient = {
+  list: vi.fn(async () => []),
+  listDrafts: vi.fn(async () => []),
+  layered: vi.fn(async () => ({ effective: PAGE, code: PAGE, editable: true })),
+  getDraft: vi.fn(async () => null),
+  get: vi.fn(async () => null),
+  save: vi.fn(async () => ({})),
+  saveDraft: vi.fn(async () => ({})),
+};
+
+vi.mock('./useMetadata', async (importOriginal) => {
+  const mod = await importOriginal<typeof import('./useMetadata')>();
+  return {
+    ...mod,
+    useMetadataClient: () => mockClient,
+    useMetadataTypes: () => ({
+      entries: [{ type: 'page', name: 'page', label: 'Page', allowEnvironmentOverlay: true }],
+    }),
+  };
+});
+
+import { MetadataResourceEditPage } from './ResourceEditPage';
+import { registerBuiltinInspectors } from './inspectors';
+import { registerMetadataPreview, getMetadataPreview, type MetadataSelection } from './preview-registry';
+import { __setCelFormulaLoader } from './celAuthoring';
+
+registerBuiltinInspectors();
+
+const DANGLING = /[*+\-/&|=<>]\s*$/;
+
+function stubEngine() {
+  __setCelFormulaLoader(() =>
+    Promise.resolve({
+      validateExpression: (_role: string, input: unknown) => {
+        const src = typeof input === 'string' ? input : String((input as { source?: string })?.source ?? '');
+        return DANGLING.test(src)
+          ? { ok: false, errors: [{ message: 'Parse error: expression ends after an operator' }], warnings: [] }
+          : { ok: true, errors: [], warnings: [] };
+      },
+      introspectScope: () => ({ fields: ['amount'], roots: ['record'], functions: ['has'] }),
+      inferExpressionType: () => 'boolean' as const,
+    }),
+  );
+}
+
+/** Canvas stand-in: emits the selections the real canvas emits on click and on an empty click. */
+function StubPageCanvas({
+  onSelectionChange,
+}: {
+  onSelectionChange?: (next: MetadataSelection | null) => void;
+}) {
+  return (
+    <>
+      <button type="button" onClick={() => onSelectionChange?.({ kind: 'block', id: 'regions[0].components[0]', label: 'Intro text' })}>
+        select the first block
+      </button>
+      <button type="button" onClick={() => onSelectionChange?.({ kind: 'block', id: 'regions[0].components[1]', label: 'Footer text' })}>
+        select the second block
+      </button>
+      <button type="button" onClick={() => onSelectionChange?.(null)}>
+        clear the selection
+      </button>
+    </>
+  );
+}
+
+const realPagePreview = getMetadataPreview('page');
+
+beforeEach(() => {
+  stubEngine();
+  registerMetadataPreview('page', StubPageCanvas as never);
+});
+
+afterEach(() => {
+  cleanup();
+  __setCelFormulaLoader(undefined);
+  mockClient.save.mockClear();
+  mockClient.saveDraft.mockClear();
+  if (realPagePreview) registerMetadataPreview('page', realPagePreview);
+});
+
+const saveButton = () =>
+  screen.getByRole('button', { name: /Save \(⌘S\)|Fix the issues shown in the inspector before saving\./ });
+
+/** Past the autosave's 1.5 s debounce. */
+const outlastDebounce = () => new Promise((r) => setTimeout(r, 2300));
+
+async function openFirstBlockCel(): Promise<HTMLTextAreaElement> {
+  fireEvent.click(await screen.findByRole('button', { name: 'select the first block' }));
+  fireEvent.click(await screen.findByText('Expression'));
+  return screen.getAllByRole('combobox').find((el) => el.tagName === 'TEXTAREA') as HTMLTextAreaElement;
+}
+
+async function breakFirstBlock(): Promise<void> {
+  render(
+    <MemoryRouter initialEntries={['/metadata/page/home']}>
+      <MetadataResourceEditPage type="page" name="home" />
+    </MemoryRouter>,
+  );
+  const box = await openFirstBlockCel();
+  fireEvent.change(box, { target: { value: 'record.amount >' } });
+  await waitFor(() => expect(saveButton()).toBeDisabled(), { timeout: 4000 });
+}
+
+const LEAVERS: Array<[string, () => void]> = [
+  ['clearing the selection', () => fireEvent.click(screen.getByRole('button', { name: 'clear the selection' }))],
+  ['selecting another block', () => fireEvent.click(screen.getByRole('button', { name: 'select the second block' }))],
+];
+
+describe('MetadataResourceEditPage — the CEL hold belongs to the draft, not to the selection (objectstack#27629)', () => {
+  it.each(LEAVERS)('%s keeps Save and the autosave held, and the held line names the block', async (_how, leave) => {
+    await breakFirstBlock();
+    leave();
+    await outlastDebounce();
+    expect(mockClient.save).not.toHaveBeenCalled();
+    expect(mockClient.saveDraft).not.toHaveBeenCalled();
+    expect(saveButton()).toBeDisabled();
+    expect(screen.getByTestId('inspector-held-message')).toHaveTextContent('Intro text');
+  });
+
+  it('"Show me" reopens the block with its text, and fixing it there releases the hold', async () => {
+    await breakFirstBlock();
+    fireEvent.click(screen.getByRole('button', { name: 'clear the selection' }));
+    await waitFor(() => expect(screen.getByTestId('inspector-held')).toBeInTheDocument(), { timeout: 3000 });
+
+    fireEvent.click(screen.getByRole('button', { name: 'Show me' }));
+    const box = await waitFor(() => {
+      const el = screen.queryAllByRole('combobox').find((e) => e.tagName === 'TEXTAREA') as HTMLTextAreaElement | undefined;
+      expect(el).toBeTruthy();
+      return el!;
+    });
+    expect(box.value).toBe('record.amount >');
+    fireEvent.change(box, { target: { value: 'record.amount > 20' } });
+    await waitFor(() => expect(saveButton()).toBeEnabled(), { timeout: 4000 });
+    expect(screen.queryByTestId('inspector-held')).toBeNull();
+  });
+});